极差
135-110=25kPa<0.3fakm=0.3×125=37.5kPa
fak=125kPa
持力层土的e=0.8,IL=0.75,ηb=0.3,ηd=1.6
fa=fak+ηbγ(b-3)+ηdγm(d-0.5)
=125+0.3×8×(4-3)+1.6×